Consistent modeling of velocity statistics and redshift-space distortions in one-loop perturbation theory

By Shi-Fan Chen, Z. Vlah, M. White. Journal of Cosmology and Astroparticle Physics, 2020

133 citations recorded by the source corpus.

The peculiar velocities of biased tracers of the cosmic density field contain important information about the growth of large scale structure and generate anisotropy in the observed clustering of galaxies. Using N-body data, we show that velocity expansions for halo redshift-space power spectra are converged at the percent-level at perturbative scales for most line-of-sight angles μ when the first three pairwise velocity moments are included, and that the third moment is well-approximated by a counterterm-like contribution. We compute these pairwise-velocity statistics in Fourier space using both Eulerian and Lagrangian one-loop perturbation theory using a cubic bias scheme and a complete set of counterterms and stochastic contributions. We compare the models and show that our models fit both real-space velocity statistics and redshift-space power spectra for both halos and a mock sample of galaxies at sub-percent level on perturbative scales using consistent sets of parameters, making them appealing choices for the upcoming era of spectroscopic, peculiar-velocity and kSZ surveys.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/0e4fb671b906275ccb2341921eaad12859c56ec7

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Shi-Fan Chen
2. Z. Vlah
3. O. Philcox
4. Mikhail Ivanov
5. M. White
6. E. Castorina
7. L. Senatore
8. J. Tinker

In Instrumentation

1. Shi-Fan Chen
2. Z. Vlah
3. O. Philcox
4. M. White
5. Mikhail Ivanov
6. E. Castorina
7. L. Senatore
8. J. Tinker

Citations in the corpus

• A new analysis of galaxy 2-point functions in the BOSS survey, including full-shape information and post-reconstruction BAO (2021, methodology): “We acknowledge the use of Cobaya [102, 103], Class [50], GetDist [104] and velocileptors [17] and thank their authors for making these products public.”
• BOSS DR12 full-shape cosmology: ΛCDM constraints from the large-scale galaxy power spectrum and bispectrum monopole (2021, methodology): “To model the window-free power spectrum and bispectrum, we utilize the EFTofLSS, as implemented in the Boltzmann code class-pt [81] (see also [82, 83]).”
• Redshift-space distortions in Lagrangian perturbation theory (2020, methodology): “Existing LPT formulations typically incorporate bulk velocities either via streaming model resummations [22, 23, 49] or direct expansions of velocity statistics [23, 49].”